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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa5ba7c246a7a1f53da6819c4f7e04dda51f36a4133621fff8b4cef1ab6d2f7' 
  AND token = 'U2ardOS0eC952CoWN0r9z/ciH6xX7t7lKp7hteT8Mz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}